Russia Calls Alliance's Decision to Suspend Cooperation a Throwback to Cold War

BRUSSELS—The top military commander of the North Atlantic Treaty Organization said Wednesday that Russian forces could take large swaths of Ukraine in three to five days.

U.S. Air Force Gen. Philip Breedlove, the supreme allied commander in Europe, also said in an interview that he will recommend a "reassurance package" to NATO representatives by April 15. The measures will be aimed at enhancing the alliance's response to...